Workout/excercise mat on carpet

I'm about to embark on Insanity and have read a lot of people's reviews that the athleticism of the exercises favour a hard floor with a mat. All of the suitable rooms for me to carry out these workouts have carpet and so hard floor isn't an option.

I've had and seen a few of the typical yoga type mats on offer and they ruck, crease and slip around. Are they any mats or techniques for attaching such mats that people have had success with on carpet?

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